"The captain made the decision to request medical support and offload Ms Evans so she could access medical assistance," the spokesman said.

"We would not have wanted to endanger Ms Evans by delaying medical help had she worsened during the flight."

While every airline's policy differs, most have the right to refuse passengers who have conditions which may worsen during a flight.

Members of the cabin crew are required to notify the plane's captain if they notice any passenger who may be ill, or who may become more ill, during the trip, and many airlines are not required to offer refunds to passengers who are asked to leave a flight for these reasons.

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